f(z,y)=e-x.sin(x+2y),求

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问题 f(z,y)=e-x.sin(x+2y),求

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答案f(x,y)=e-x.sin(x+2y), ∴fx(z,y)=一e-x.sin(x+2y)+e-x.cos(x+2y) ∴fxy’’(x,y)=一2e-x.cos(x+2y)一2e-x.sin(x+2y)[*]

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